MINES AND PRODUCTIVE LOCALITIES. 165 
WEST ASPEN MOUNTAIN. 
Pride of Aspenmine. (See Pl. XLI, d.)—The Pride of Aspen workings 
consist chiefly of two tunnels and a shaft. The shaft is 400 feet deep, 
having passed through 250 feet of glacial drift, 190 feet of Weber shales, 
and 60 feet of the gray limestone which forms the base of the Maroon 
formation. The position of the Weber above the Maroon gray limestone 
in the shaft, taken together with the dips of the formations in the two 
levels, shows that the strata have been locally overturned. There are 
two levels from the shaft, one at 200 feet and one at 400 feet. The upper 
one runs west a short distance in Weber shales; the lower one starts in the 
Maroon gray limestone and runs west in solid limestones and shales, which 
become soft as the drift advances westward toward the Pride fault. This 
fault is cut about 200 feet from the shaft, and on the other side the Cam- 
brian quartzite is exposed. The upper tunnel runs south, and is for most 
of its length directly in the Pride fault. The Pride fault has a very steep 
easterly dip, so that the foot wall is dolomite and the hanging wall shale. 
The shale of the hanging wall is mixed with limestone and porphyry, 
sometimes brecciated, sometimes in large, solid bodies. The second tunnel, 
which is 90 feet below the other one, is in Weber limestone, and does not 
cross the fault, although it runs very close to it. In this locality there are 
many fractures, the chief set trending due east and west and dipping north 
at an angle of 40 degrees. These fractures stop at the Pride fault and 
correspond to the east-west breaks which are developed on the north end 
of West Aspen Mountain. . 
The ore in the Pride of Aspen. is found in the immediate vicinity of 
the Pride fault. The known ore bodies all lie parallel to this fault and at 
varying distances from it, in the shale on the east side, and have probably 
developed along fractures which were formed at the same time as the main 
fault. Some of the ore seems to have a connection, also, with the east- 
west, northerly dipping faults and fractures. The owners of the property 
believe that one of these faults crosses the Pride fault, and that at the 
junction of the two their ore is situated. The continuation of the east-west 
faults to the east of the Pride is doubtful, and certainly has not been 
proved by the developments thus far. The ore is low grade in silver, and 
carries much lead and some zine, with less than 1 per cent of baryta. 
